In order to develop a method for evaluating vibrational energies and wave functions of a polyatomic molecule by quantum computing, we introduce the reduced multistate contracted variational quantum eigensolver (RMC-VQE) method, which is a variant of the multistate contracted VQE method [Parrish et al., Phys. Rev. Lett. 122, 230401 (2019)], and apply the RMC-VQE method to a two-mode model of CO2. In the RMC-VQE method, much fewer matrix elements of the Hamiltonian are evaluated on the quantum computer than in the MC-VQE method. By measuring the matrix elements of the Hamiltonian using the quantum computer ibm_kawasaki and diagonalizing the Hamiltonian matrix on a classical computer, we obtain the vibrational energies of the Fermi doublet, which differ from the exact energies obtained using a classical computer by less than 0.1 cm−1. We also obtain accurate vibrational wave functions of the Fermi doublet states.
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September 2022
Research Article|
July 13 2022
Evaluation of vibrational energies and wave functions of CO2 on a quantum computer
Erik Lötstedt
;
Erik Lötstedt
a)
(Conceptualization, Investigation, Methodology, Writing – original draft, Writing – review & editing)
1
Department of Chemistry, School of Science, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Kaoru Yamanouchi
;
Kaoru Yamanouchi
b)
(Conceptualization, Funding acquisition, Investigation, Methodology, Writing – original draft, Writing – review & editing)
1
Department of Chemistry, School of Science, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Yutaka Tachikawa
Yutaka Tachikawa
(Investigation, Writing – original draft, Writing – review & editing)
2
DIC Corporation, Central Research Laboratories
, 631, Sakado, Sakura, Chiba 285-8668, Japan
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a)
Electronic mail: lotstedt@chem.s.u-tokyo.ac.jp
b)
Electronic mail: kaoru@chem.s.u-tokyo.ac.jp
AVS Quantum Sci. 4, 036801 (2022)
Article history
Received:
March 11 2022
Accepted:
June 21 2022
Citation
Erik Lötstedt, Kaoru Yamanouchi, Yutaka Tachikawa; Evaluation of vibrational energies and wave functions of CO2 on a quantum computer. AVS Quantum Sci. 1 September 2022; 4 (3): 036801. https://doi.org/10.1116/5.0091144
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